What is the common techniques for lasting the par and the perfumes in CP Process

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I am not familiar with the term "lasting the par." Perhaps you meant long lasting bar as in long lasting bar of soap? If so, then that is mostly a matter of what oils one uses.
The following is from a member's paper on fatty acids:
"Longevity = Palmitic + Stearic acids
Palmitic and stearic acids -- the fatty acids in lard, tallow, palm, and butters -- create a soap that is hard and fairly insoluble in water."
The complete paper can be found at this site:

https://classicbells.com/soap/soapCalcNumbers.asp
Also, it is important to cure your soap for at least 4 weeks. I cure most of my soaps for 8 weeks, some types of soap I cure longer.

As far as adding fragrance, I have seen several approaches. My preference is to add it at light trace. As far as the amount, I usually use a fragrance calculator, where you put in the weight of the oils and it tells you the amount of fragrance to use. Some countries have guidelines about the maximum amount of certain ingredients one can use and/or one has to have their formula approved by a government department.

Hope this helps. Otherwise, please ask follow up questions.
 
If you're asking how to make perfumes (i.e., scents) last in CP soapmaking - there a lot of techniques folks recommend.
As stated above - adding your essential oils or fragrance near the end of your process (when it reaches trace) is one way. Another way is to "anchor" your scents by using an additive that will absorb the scent and allow it to last longer in your soap. There are a variety of clays (e.g., kaolin) that you can use. I've once dried lemon peel and then soaked them in lemon essential oil to make a soap with a strong citrus scent that also features an exfoliant.
For more tricks, look up "anchoring scents" for other tips like this:
https://nurturesoap.com/blogs/nurture-soap-blog/anchoring-fragrances-in-cold-process-soap
 
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